"Sarah went to a party last week. Paul went to the party too, but they didn´t see each other. Paul left the party at 10:30 and Sarah arrived at 11:00. So: When Sarah arrived at the party, Paul wasn´t there. He had gone home".
Had gone is the past perfect.
The past perfect simple is had + past participle (gone / seen / finished etc.)
Sometimes we talk about something that happened in the past:
- Sarah arrived at the party.
- When Sarah arrived at the party, Paul had already gone home.
I / You / We / They / He / She / It had gone.
I / You / We / They / He / She / It hadn´t gone.
Had I / you / we / they / he / she / it gone?